<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    let a = 10
    let b = 20n
 /* 
    typeof 检查的是变量值的类型 而不是变量的类型
 */
    console.log(typeof a,typeof  b);
</script>
</html>